Insulated electric conductor.



W. F. SMITH.

INSULATED ELECTRIC CONDUCTOR.

APPLICATION FILED OCT.3| I9I3.

Patented Apr. 25, 1916.

l j E f in. @ne eounty o2. @ook ois, beve invented. :1 Gestein i *l 'ement 1n nsuiffteoi i ei oain the i in the tee which :l to obtein e eesenL 1 1 be meintene eennetore Ven foeim eil: ie'iuetoi een?, Le;

.en .ef-Hee e gene eebee,

in insuia'ized eonduoee be in tbe menn'etui'eo tenente beve been to e eoni'liions above menti@A L, snc-,eeen 'usnete eene-ui inee in which me insiatin@ tape fofined e l'zni''im e; tight-ijf on ti e eonUCte. w sueb insueteci conductors pairs, the eonduetos o getmf the pzu'ativeiy tiei'ise,wbieb tively high eepeeity 'bet-wee;

insuetefi eonuctors. Cei/oies eve nis@ made of insuete eondue f E 1 i@ form eyindei et ineen-ein inne diemefei eeetei? than 'the eonueton 'ee Ineens bei. meinte'. the insu lute eoniiiuetois me -f the eenuetes beifeoi? ie eiose teg'etbere ifesniting in e. 1 i, between the twisteci tors und u tejetiveiy lower miei 'veying' capacity between seid pair of twisted eonuetozs and e "peil" o'f adjacent twist/eti eonnetois in 'the suine cable. Cebies beve eso been merle ei insueted conductors aonn the eenduetois of which the nsuieting tene has been wound in a eruin'pie oi* erinkie condition, which may povide e eonsic'ei'ebe nii be tween the eoncuetos and the enironfuiing" i Agni, 25., 1916.'

tape. ayeen no"f=.'ev ar, such insulated conoi .inifoimity in the the distance between e vaincue pairs to vary mete? eeb'es beve been. mafie of insulated e s, in which veious schemes have i use to maintain the insuiationwut el. with the conductor. In these schemes, 'i ve been inteposed between 'the eend eten' und suestenees wneh, whiie they may eccomb i'esuit et maintaining the in sillzLu engagement with the conductor,

ize r ,etivey high specieink'! nieuiete eenelnetors beve bee'ngrused eines have esoneeessitated adm proneing the lnsu- 'Y tbe'eoet thereof, l l inipove ferm of insulated eenuetez beiesnetei ieseribe is free from nube eetues ei: previous insutbe obje e eebiesetisiies the requireizi mentioned, by 'season of the eet te ineue ing tape 1e so wound pon the eenduetei' that e maximum and con-netsw mi seif' tape, and the conuctor is posi'h L ed within the tape.

'My nee ujpoved insuiate conduci ,tinted u )on the machine e 29., {ile Get-,ober 8, 1913, e understood as limitin to ei" my inventii'n; 1"- ey be unerstood from the eeeomnnnyingg ewiiogs in which an embodiment tbeieo iiustrated, end in which- .egui'e l is suie.

` onduetoi with the insulating tape for e short istance to lllustrate u the tene; Fig. 21s an enlarged on center line of the inform a pail" for usev me insulation various lustive @pee-ity) been th .cause of e relaeiigjreeity in the cables 1n which i eten eend reis, es above mentioned, and' i nun ai? spese is piovided between the an en'ieged View of an iii-' 4neve thereoe matesnlated conductor, illust 'ating the conductor centered in the insulation and the insulation supported by the ridge formed therein; and Fig. 3 is a sectional View on line 3-3 of Fig. l.

Referring to the drawings, 4 is a conductor around which is spiraled an insulating tape 5, preferably of paper, having formed therein an inwardly extending ridge 6, the inner margin of which engages the conductor 4. The tape covering 5 is supported by the ridge 6 and forms a smooth, cylindrical shell of uniform external diameter about the conductor 4, which is centered within the tape covering 5 by the ridge 6 and is substantially parallel to the tape covering. Since the ridge 6 is interposed be tween the conductor 4 in the tape covering 5, a definite distance is maintained therebetween and the external surface of the tape is maintained smooth and of uniform diameter.

I claim:

I. een insulated conductor for cables comprising a. conductor-'and an overlapping fibrous tape covering therefor havingl a smooth exterior' of uniform diameter and havingpan inwardly extending ridge formed therein,

spiral convolutions, said tape having a ridge formed therein leaving the portions of said tape on each side of the ridge at different distances from said conductor, the portion of each convolution of said tape farthest from said conductor overlapping at least part of the portion of the next preceding convolution nearest said conductor, said ridge being interposed between said conductor and said tape.

4. In an insulated conductor for cables, the combination with a conductor, of an overlapping fibrous tape surrounding said conductor in spiral convolutions, said tape having a ridge formed therein at a suhstantial distance from the edges thereof, said ridge registering with an edge of adjacent convolutions of said tape and being interposed between said conductor and said tape to maintain a definite distance therebetween and to maintain the external surface of said tape smooth and of uniform diameter.

5. In an insulated conductor for cables the combination with a conductor, over-- lapping paper tape covering therefor having a single spiral ridge formed therein, said ridge being interposed between said conductor and said tape with the inner margin thereof engaging said conductor and supporting said tape as a smooth cylindricall shell of uniform external diameter substantially `parallel to said conductor.

In witness whereof, I hereunto subscribe my name this 26th day of September, A, D., 1913.

VJILLIAM F. SWITH. Witnesses R. R. IRELAND, A. PRUssMAN. 

